Studies on kinetics of biodissolution of metals from Indian Ocean nodules

Mehta, K D and Pandey, B D and Mankhand, T R (2003) Studies on kinetics of biodissolution of metals from Indian Ocean nodules. Minerals Engineering, 16 (6). pp. 523-527.

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This paper describes the studies on kinetics of bio-dissolution of valuable metals such as copper, nickel and cobalt from the Indian Ocean nodules using Thiobacillus ferrooxidans and Thiobacillus thiooxidans in the presence of pyrite and sulphur. The bacterial oxidation of pyrite and sulphur produces ferrous sulphate and sulphurous acid respectively which reduce Mn(IV) of the nodules to Mn(II), thereby dissolving the metals through indirect mechanism. The leaching data collected in the temperature range 293–308 K at a pH of 2 and 5% pulp density with the particle size of 300 to −75 μm, show that the dissolution of the metals follows shrinking core kinetic model. The leaching is controlled by the diffusion of the lixiviant through the product layer which is also indicated by the activation energy values.

Item Type:Article
Official URL/DOI:
Uncontrolled Keywords:Bioleaching; Bacteria; Reaction kinetics
Divisions:Metal Extraction and Forming
ID Code:267
Deposited On:16 Nov 2009 10:15
Last Modified:16 Nov 2009 10:15
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